Hi tczmbara
Don't worry.
I know ( or I have ) identical situation. On one area few buildings. This buildings are occupied by two customers. ( in this some building two customers ). Each customer have own MD110 with GAP. In some places base stations are placed in this same localizations like conference rooms, snack-bar (canteen), lounge and distance between base station is from 1m to 2m.
Both systems are working without problems.
It is no problem but my observation: logging ( subscribing ) time.
User of PP make switch ON . If PP "see" only own system logging time is ca from 3 to 5 seconds. But if PP "see" more that one system, subscribing time can be to 30 seconds.
Best Regards
??? Michal are You from Poland?
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If anything can go wrong, it will.
(Murphy's Law)